Update cheatsheets

gv2gml

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# gv2gml
+
+> Convert a graph from `gv` to `gml` format.
+> Converters: `gml2gv`, `gv2gml`, `gv2gxl`, `gxl2gv`, `graphml2gv` & `mm2gv`.
+> More information: <https://graphviz.org/pdf/gml2gv.1.pdf>.
+
+- Convert a graph from `gv` to `gml` format:
+
+`gv2gml -o {{output.gml}} {{input.gv}}`
+
+- Convert a graph using `stdin` and `stdout`:
+
+`cat {{input.gv}} | gv2gml > {{output.gml}}`
+
+- Display help:
+
+`gv2gml -?`